• Daina Kashiwazaki, Hisayasu Saito, Haruto Uchino, Naoki Akioka, Emiko Hori, Takashi Shibata, Takahiro Tomita, Takuya Akai, Naoya Kuwayama, and Satoshi Kuroda.
• Department of Neurosurgery, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama, Japan. Electronic address: dkashiwa@med.u-toyama.ac.jp.
• World Neurosurg. 2020 Jan 1; 133: e348-e355.

BackgroundMorbidity and mortality conferences (MMCs) are now widely implemented in clinical hospitals, but their impact on the education for neurosurgeons remains limited. This prospective study was aimed to assess the efficacy and benefit of MMCs on the education for neurosurgeon.MethodsAll morbidity and mortality events were prospectively recorded and were categorized on the basis of 2 viewpoints. First, they were classified into "avoidable" and "unavoidable" events, based on the quality of each event. Simultaneously, they were classified into 3 groups, including the residents, attendant members, or unclassifiable, based on the experience of the neurosurgeon who were most closely related to each event. The information was compared between early (2013-2014) and late (2015-2017) study periods to evaluate the education value of MMCs.ResultsDuring a 5-year study period, 44 mortality (2.1% per patient) and 201 morbidity events (9.7% per patient) were recorded. There were no significant differences in the incidence of mortality between 2 periods (P = 0.52). The incidence of morbidity significantly decreased from 11.5% (83/723) to 8.4% (118/1403; P < 0.04). Of these, "avoidable" events, but not "unavoidable" events significantly decreased from 7.5% (54/723) to 4.2% (59/1403; P = 0.001). The decrease in the incidence of "avoidable" morbidity was more pronounced in the residents than in the attendant members (P = 0.007 and P = 0.04, respectively).ConclusionsKnowledge acquisition from MMCs can significantly reduce "avoidable" morbidity events in both residents and experienced neurosurgeons. The educational effect was more distinct in the residents.Copyright © 2019 Elsevier Inc. All rights reserved.

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